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Abstract
Introduction
Geologic setting
Ammonite sequence
Historical background of the Montana group
Stratigraphy of the Montana Group, Montana
Stratigraphy of rocks equivalent to the Montana Group, Wyoming
Correlation of rocks of the Montana Group
Geological history of the Montana Group
Telegraph Creek-Eagle regression
Claggett transgression
Judith River regression
Bearpaw transgression
Fox Hills regression, initial phase
Fox Hills regression, final phase
Rates of transgression and regression
Rates of sedimentation
References cited.
Introduction
Geologic setting
Ammonite sequence
Historical background of the Montana group
Stratigraphy of the Montana Group, Montana
Stratigraphy of rocks equivalent to the Montana Group, Wyoming
Correlation of rocks of the Montana Group
Geological history of the Montana Group
Telegraph Creek-Eagle regression
Claggett transgression
Judith River regression
Bearpaw transgression
Fox Hills regression, initial phase
Fox Hills regression, final phase
Rates of transgression and regression
Rates of sedimentation
References cited.